• [ CXLE87193 ]"

Ordering

Deep Analysis of CXLE87193 Three Channel High Brightness LED Constant Current Driver Chip

          In today's constantly upgrading LED lighting and display applications, efficient, stable, and flexible driver chips have become the core of system design. JTM-IC has launchedCXLE87193It is a three channel constant current drive circuit designed specifically for high brightness LEDs, integrating multiple advanced functions and suitable for various scenarios such as point light sources, guardrail tubes, soft light strips, indoor and outdoor large screens, etc. This article will provide an in-depth introduction to its technical characteristics, application circuits, and design points, helping engineers create higher performance LED systems.n6K嘉泰姆

1、 Product Introduction

            CXLE87193 is a high-performance and highly integrated three channel LED driver chip that integrates MCU single wire digital interface, data latch, LED constant current driver, PWM brightness control, and gamma correction circuit. This chip supportsDual channel input-output cascade interface, possessingRedundant communication capabilityEven if a single point of failure occurs in the cascade link, it does not affect the normal operation of subsequent chips, greatly improving the reliability of the system.n6K嘉泰姆

2、 Main technical features

•    Wide voltage operating range：4.0V ~ 5.5Vn6K嘉泰姆

•    Fixed output current：12mAn6K嘉泰姆

•    RGB brightness levelLevel 65536 (supports GAMA correction)n6K嘉泰姆

•    High precision current output：n6K嘉泰姆

•    Inter channel error; 3%n6K嘉泰姆

•    Inter chip error; 5%n6K嘉泰姆

•    Data transmission rate：800KHzn6K嘉泰姆

•    package form：SOP8， Suitable for standard SMT processn6K嘉泰姆

•    Built in power on resetThe default output is in the off staten6K嘉泰姆

3、 Detailed explanation of core functions

3.1. Dual channel cascade and redundancy design

CXLE87193 has DIN and FDIN dual input interfaces and supportsAutomatic switching and data shaping forwardingWhen a chip is damaged, the backup port can ensure that subsequent chips continue to receive data, avoiding the failure of the entire link due to a single point of failure.n6K嘉泰姆

3.2. High precision PWM dimming and gamma correction

Each RGB channel supports 8-bit PWM dimming (256 levels), combined with built-in gamma correction function, which can achieve smoother brightness changes and more realistic color reproduction, especially suitable for high demand visual display scenes.n6K嘉泰姆

3.3. Automatic clock synchronization and data regeneration

The chip is equipped with an oscillation circuit that can automatically synchronize the clock based on data line signals. The data will not attenuate during the cascading process, supporting long-distance and multi node transmission, suitable for large LED display screens and light strip systems.n6K嘉泰姆

4、 Electrical characteristics and reliability

             

(1) The chip can operate normally within the range of 1.25s (frequency 800KHz) to 2.5-ms (frequency 400KHz) for 0 or 1 code cycles, but 0 and 1 coden6K嘉泰姆
The high-level time must comply with the corresponding numerical range in the table above;n6K嘉泰姆
(2) When no reset is required, the low-level time between bytes should not exceed 25 seconds, otherwise the chip may reset and then receive data again, making it impossible to achieve datan6K嘉泰姆
Correctly transmitted.n6K嘉泰姆

           n6K嘉泰姆
D1、D2、D3、D4、… … 、 Dn is the PWM setting command for each chip.  n6K嘉泰姆
Reset indicates a reset signal, low level is valid.  n6K嘉泰姆
4.5.3       Dn's data format;     

n6K嘉泰姆
Each PWM setting command contains 8× 3 bits of data, high bits are sent first.  n6K嘉泰姆
R [7:0]: Used to set the PWM duty cycle of R output. All 0 codes indicate shutdown, all 1 code indicates maximum duty cycle, adjustable in 256 levels.  n6K嘉泰姆
G [7:0]: Used to set the PWM duty cycle of G output. All 0 codes indicate shutdown, all 1 code indicates maximum duty cycle, adjustable in 256 levels.  n6K嘉泰姆
B [7:0]: Used to set the PWM duty cycle of B output. All 0 codes indicate shutdown, all 1 code indicates maximum duty cycle, adjustable in 256 levels.  

n6K嘉泰姆
Among them, S1 is the data sent by the Di port of the controller, and S2, S3, S4, and Sn are the data forwarded by the cascaded CXLE87193.n6K嘉泰姆
Controller Di and Fi2 port data structure: D1D2D3D4… … Dn； n6K嘉泰姆
Controller Fi Port Data Structure: DxD1D2D3… … Dn； n6K嘉泰姆
Among them, Dx is any 24 bit data bit.n6K嘉泰姆
n6K嘉泰姆
The process of chip cascading and data transmission and forwarding is as follows: the controller sends data S1, chip 1 absorbs D1, and if there is no reset at this timen6K嘉泰姆
Signal, chip 1 will continue to forward the data sent by the controller; Chip 2 absorbs D2. If there is no Reset signal at this time, chip 2n6K嘉泰姆
We will continue to forward the data sent by chip 1. Repeat this process until the controller sends a Reset signal, completing a data refresh cycle,n6K嘉泰姆
The chip has returned to the receiving preparation state. Reset low level is effective. If the low level is maintained for more than 80 seconds, the chip will be reset.

5、 Typical Application Circuit

5.1    Double line cascade wiring diagram

Controller→  DIN → Chip 1→  DO →  DIN → Chip 2→  . .. → Chip nFDIN (backup input)

n6K嘉泰姆

To prevent the instantaneous high voltage generated by live plugging and unplugging of the product during testing from causing damage to the input and output pins of the chip signal, it is necessary to address the issues of signal input and output;n6K嘉泰姆
Output pin connected in series with 100Ω Protect the resistor. In addition, the 104 decoupling capacitors of each chip in the figure are indispensable, and they are routed to the VDD and GND of the chip;n6K嘉泰姆
Feet should be as short as possible to achieve the best decoupling effect and stabilize chip operation.n6K嘉泰姆

5.2.    Design suggestions：n6K嘉泰姆

•    Connect 100Ω in series with DIN, FDIN, and DO ports; Resistance, protection against plug-in impact;n6K嘉泰姆

•    Connect 104 capacitors in parallel between each VDD and GND, and the decoupling line should be as short as possible;n6K嘉泰姆

•    Using SOP8 packaging, the layout is compact and suitable for high-density PCB design.n6K嘉泰姆

5.3.          Input-output equivalent circuitn6K嘉泰姆

n6K嘉泰姆

5.4.        Internal structure diagram;n6K嘉泰姆

n6K嘉泰姆

6、 Data refresh rate calculation

        CXLE87193 requires 24 bit data transmission per pixel (RGB). At a communication rate of 800KHz, the period per bit is 1.25 ms, and the transmission time for one pixel is approximately 30 ms. The relationship between system cascaded pixels and refresh rate is as follows:n6K嘉泰姆

            Users can flexibly adjust the number of cascades and communication speed according to actual project requirements.n6K嘉泰姆

The data refresh time is calculated based on how many pixels are cascaded in a system, with a set of RGB typically consisting of one pixel (or segment),n6K嘉泰姆
A CXLE87193 chip can control a set of RGB.n6K嘉泰姆
Calculated according to normal mode:;n6K嘉泰姆
The 1-bit data period is 1.25 μ s (frequency 800KHz), and one pixel data includes R (8-bit), G (8-bit), and B (8-bit)n6K嘉泰姆
24bit， The transmission time is 1.25μ s× 24≈ 30μs。 If there are a total of 1000 pixels in a system, when refreshing all displays at oncen6K嘉泰姆
Between 30μ s× 1000=30ms， The one second refresh rate is: 1÷ 30ms=33.3Hz。  n6K嘉泰姆
The following is the table of the highest data refresh rate corresponding to cascading points:;n6K嘉泰姆

n6K嘉泰姆

7、 Constant current performance display

        CXLE87193 can maintain stable output current even when the load voltage changes, with a smooth constant current curve and minimal inter channel differences. As shown in the figure below, when the OUT port voltage varies within the range of 0.5V~5V, the output current is basically maintained at 12mA, ensuring consistent LED brightness and color uniformity.n6K嘉泰姆

! [Constant current curve graph]n6K嘉泰姆
n6K嘉泰姆

8、 Packaging and Pin Description

CXLE87193 adoptsSOP8 encapsulationCompact size, suitable for automated surface mount production. The pin definitions are as follows:n6K嘉泰姆

9、 Conclusion

          CXLE87193, as a highly integrated and reliable three channel LED constant current driver chip, performs excellently in current consistency, color control, system redundancy, and is particularly suitable for LED display and lighting systems that require high refresh rates and stability.n6K嘉泰姆

  For more technical information, reference designs, or sample applications about CXLE87193, please visitJTM-IC official websiteWe will provide you with professional technical support and complete solutions.n6K嘉泰姆

tenTheSelection Guide for Related Chips;                          More similar products ....n6K嘉泰姆

◀ Previous:CXLE87192 Single Wire Three Channel LED Constant Current Driver Chip -256 Level Brightness Adjustment SOP8 Package | Jiataimu Semiconductor

Back to top

Next▶:CXLE87194 Three Channel High Brightness LED Constant Current Driver Chip - JTM-IC Official Data Sheet and Application Guide